And do you think a plumber earning 100+ grand would be an easy job where you would have enough time with your family and friends.
Or more to the point, do you think it would be easy to get certified to that level of pay and not be dedicated to your job.
I know a number of plumbers who earn over 50,000. None of them work less than 60 hours a week (sometimes in freezing winter) - they get called at ungodly hours, and many have had to beg to get paid and have had confrontations with numskulls who did their best to say their jobs weren't up to scatch.
Its not an easy job, and is paid accordingly depending on how experienced they are. Someone earning 100,000 in plumbing is a master plumber & it takes a fair while & lots of dedication and commitment to reach that level, same as any profession.